/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Collision/ParticleCollisions.h
Add a mid phase to the list We are passing the particle and midphase here rather than just the key because we store a cookie on the midphase that we want to retrieve, and it has one cookie per particle. This could probably be cleaned up a bit...
void AddMidPhase ( [FGeometryParticleHandle](API\Runtime\Chaos\Chaos\FGeometryParticleHandle) * InParticle, [FParticlePairMidPhase](API\Runtime\Chaos\Chaos\Collision\FParticlePairMidPhase) * InMidPhase )